For all purposes the 470 Nitro and the 450 Nitro are twins! Both throw out about a 480/500 grain bullet at the same speed. The 470 is a very few thousanth's of an inch bigger diameter. Hardly enough to make any difference. I have a Searcy 450NE and a JP Sauer conversion to a 450NE from a 12 ga shotgun. Both shoot great!
-------------------- "When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand